Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Taskbook - Like Trello but for the Terminal
Do by InVision - The world's most versatile to-do app UI kit for PS & Sketch
Todorant - Tricks yourself into craving completing tasks
TickTick - TickTickis a cross-platform to-do list app & task manager helps you to get all things done and make life well organized.
Thrive - Thrive is an intuitive tool to manage your business using the latest trends in Project Management, Dashboards, Customer Relationship Management & Accounting